<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>id选择器</title>
	</head>
	<style type="text/css">
		#red {
			color: red;
		}
	</style>
	<body>
		<div id="red">小江老师</div>
		<div id="red">样式#定义，结构id调用，只能调用一次，别人切勿使用</div>
	</body>
</html>
